KR20110122345A - Polarizing plate and organic electroluminescent device having the same - Google Patents

Abstract

PURPOSE: A polarizing plate and an organic electroluminescent device having the same are provided to be thin while performing mass production through a bonding process. CONSTITUTION: In a polarizing plate and an organic electroluminescent device having the same, a polarizer(20) includes a phase difference layer(23) and converts the light passed through the polarizer into circular polarization. A phase difference layer(33) coverts the circular polarization into linear polarization. A liquid crystal panel(31) is synchronized with a time-divided display surface cycle. The polarizer passes through light from the liquid panel. A liquid crystal shutter eyeglasses(30) includes the polarizer.

Description

Polarizing plate and organic light emitting device including the same {POLARIZING PLATE AND ORGANIC ELECTROLUMINESCENT DEVICE HAVING THE SAME}

The present invention relates to a polarizing plate having a simple manufacturing process and easy to mass production, and an organic light emitting display device comprising the same.

An organic light emitting device is a self-luminous display device that electrically excites an organic compound to emit light.

The organic light emitting device includes an organic light emitting layer between the anode and the cathode. In such a device, holes supplied from an anode and electrons received from a cathode combine in an organic light emitting layer to form an exciton, a hole-electron pair, and emit light by energy generated when the excitons return to the ground state.

In an organic electroluminescent device, an ITO transparent electrode, a light emitting layer, and a metal electrode are usually laminated on a glass substrate. When external light is incident, reflected light is generated on the surface of the glass substrate and the metal electrode, thereby degrading image display quality. In order to prevent such reflection, a circularly polarized film composed of a polarizer and a λ / 4 retardation plate was disposed on the front surface of the light emitting device.

In addition, the liquid crystal shutter glasses type stereoscopic image display device has a circularly polarized film composed of a polarizer and a λ / 4 phase difference plate on the side of the wearer of the glasses to enable image recognition even if the wearer moves the head up, down, left and right.

The circularly polarized film should maintain the transmission axis of the polarizer and the slow axis of the λ / 4 retardation plate at 45 °. However, since the polarizer and the retardation plate are usually stretched in the manufacturing process, the stretching direction becomes the absorption axis or the slow axis.

Circularly polarized film cuts the lambda / 4 phase difference plate on the polarizer on the sheet (sheet to sheet) or roll (roll to sheet, see Fig. 1), the transmission axis of the polarizer and the slow axis of the lambda / 4 phase difference plate 45 degrees It was manufactured using the method of pasting so as to hold (Patent No. 04-123008, Japanese Patent Publication No. 06-300918). This method has a disadvantage in that the yield is low because the process is complicated and the material loss is disadvantageous for mass production and the foreign matter management is difficult.

As described above, the liquid crystal shutter glasses type stereoscopic image display apparatus using the organic light emitting display device should be able to recognize images even when the wearer moves the head up, down, left and right simultaneously with the antireflection function of the organic light emitting display device.

The present invention can be manufactured by a continuous bonding process such as a roll-to-roll, and to provide a polarizing plate that is easy to mass production in a high yield and thinner because of easy material loss and foreign matter management compared to the prior art.

In addition, the present invention can be applied to the liquid crystal shutter glasses type stereoscopic image display device using an organic light emitting device has an anti-reflection function for the external light, and a polarizing plate that can realize stereoscopic image even if the wearer moves the head up, down, left and right To provide.

1. A polarizing plate wherein a lambda / 4 phase difference layer is formed on both sides of the polarizer, and these two phase difference layers are layers or gradient stretched films containing a reactive liquid crystal compound independently of each other.

2. The polarizing plate of 1 above, wherein one of the two λ / 4 retardation layers is a layer containing a reactive liquid crystal compound, and the other is a gradient stretched film.

3. The polarizing plate of 1 above, wherein the transparent protective film is bonded between at least one of the polarizer and the λ / 4 retardation layer.

4. The polarizing plate of claim 3, wherein the alignment layer is formed between at least one of the transparent protective film and the λ / 4 retardation layer.

5. The polarizing plate of 1 above, wherein the transmission axis of the polarizer forms an angle of 45 ° with the slow axis of the λ / 4 retardation layer.

6. The polarizing plate of 1 above, wherein the λ / 2 retardation layer is formed between the polarizer and at least one of the λ / 4 retardation layers.

7. In the above 6, the slow axis of the λ / 2 phase difference layer is an angle of 15 degrees essentially with respect to the transmission axis of the polarizer, the slow axis of the λ / 4 phase difference layer is essentially an angle of 75 ° with respect to the transmission axis of the polarizer Polarizer.

8. The polarizing plate of any one of the above 1 to 7, wherein the polarizing plate is a roll shape.

9. The organic light emitting device including the polarizing plate of 8.

10. A method of manufacturing a polarizing plate, comprising the steps of: forming a lambda / 4 phase difference layer by bonding a composition comprising a reactive liquid crystal compound after bonding an inclined stretched film or forming an alignment layer on the polarizer independently on both sides of the polarizer. .

11. In the above 10, the manufacturing method of the polarizing plate comprising the step of bonding the transparent protective film on at least one side of the polarizer before the λ / 4 phase difference layer formation.

12. In the above 10, the polarizing plate comprising the step of forming a λ / 2 phase difference layer by bonding a film to at least one side of the polarizer before forming the λ / 4 phase difference layer, or by applying a composition containing a reactive liquid crystal compound Manufacturing method.

The polarizing plate of the present invention can be manufactured by a continuous bonding process such as roll-to-roll, and it is easy to mass-produce and thin in high yield due to easy material loss and foreign matter management compared to the prior art.

The polarizing plate of the present invention can control the internal reflection light generated by the external light incident on the light emitting surface of the device can be usefully applied to the organic light emitting device, the plasma display.

When the polarizing plate of the present invention is applied to a liquid crystal shutter glasses type stereoscopic image display device, the circular polarized light is incident on the glasses, so that the stereoscopic image can be realized even if the glasses wearer moves the head vertically.

1 is a method of bonding a polarizer and a lambda / 4 phase difference layer of a conventional example in a roll to sheet,
2 to 14 is a polarizing plate according to an example of the present invention,
Fig. 15 shows the relation between the transmission axis of the polarizer and the slow axis of the λ / 4 phase difference layer (left), the relationship between the transmission axis of the polarizer and the slow axis of the λ / 2 phase difference layer and the slow axis of the λ / 4 phase difference layer (right) )ego,
16 is an image display device according to Embodiment 1 of the present invention;
17 is an image display device according to a third embodiment according to the present invention;
18 is a schematic view showing a three-dimensional image principle of the image display device according to the first embodiment of the present invention.
19 shows the antireflection principle of the image display device according to the first embodiment of the present invention.
20 is a schematic diagram showing a three-dimensional image principle of the image display apparatus according to the third embodiment of the present invention.

The present invention relates to a polarizing plate having a simple manufacturing process and easy to mass production, and an organic light emitting display device comprising the same.

Hereinafter, the present invention will be described in detail.

In the polarizing plate of the present invention, the λ / 4 retardation layer is formed on both surfaces of the polarizer. The two λ / 4 retardation layers are layers or gradient stretched films containing a reactive liquid crystal compound independently of each other.

In the present invention, the λ / 4 retardation layer, which is a diagonal stretched film, is a λ / 4 retardation film layer, and the λ / 4 retardation layer containing a reactive liquid crystal compound is called a λ / 4 retardation liquid crystal layer. Similarly, the lambda / 2 phase difference layer which is a diagonal stretch film is a lambda / 2 phase difference film layer, and the lambda / 2 phase difference layer containing a reactive liquid crystal compound is called a lambda / 2 phase difference liquid crystal layer.

In one embodiment of the polarizer of the present invention, one side of the polarizer may be a four phase difference layer to which a gradient stretched film is bonded, and the other side may have a λ / 4 phase difference layer containing a reactive liquid crystal compound.

Further, in the polarizing plate of the present invention, for example, a λ / 4 retardation layer in which a diagonally stretched film is bonded to both surfaces of the polarizer may be formed.

In addition, the polarizing plate of the present invention may include a reactive liquid crystal compound on both sides of the polarizer, for example, to form a λ / 4 retardation layer.

In addition, in the polarizing plate of the present invention, a transparent protective film may be bonded between at least one of the polarizer and the λ / 4 retardation layer. An alignment layer may be formed between at least one of the transparent protective film and the λ / 4 retardation layer.

In the polarizing plate of the present invention, a λ / 2 phase difference layer may be formed between the polarizer and at least one of the λ / 4 phase difference layers. A transparent protective film may be bonded between the polarizer and at least one of the λ / 2 retardation layers. In addition, an alignment layer may be formed between at least one of the transparent protective film and the λ / 2 retardation layer or between at least one of the λ / 2 retardation layer and the λ / 4 retardation layer.

2-14 is a polarizing plate configuration of one example according to the present invention.

2 is a λ / 4 retardation film layer / adhesive layer / polarizer / adhesive layer / λ / 4 retardation film layer; 3 is a λ / 4 retardation film layer / adhesive layer / polarizer / λ / 4 retardation liquid crystal layer; 4 is a λ / 4 retardation film layer / adhesive layer / polarizer / adhesive layer / transparent protective film / λ / 4 retardation liquid crystal layer; 5 is a λ / 4 retardation film layer / adhesive layer / polarizer / adhesive layer / transparent protective film / alignment film / λ / 4 retardation liquid crystal layer; 6 is a λ / 4 retardation liquid crystal layer / polarizer / λ / 4 retardation liquid crystal layer; 7 is lambda / 4 phase difference liquid crystal layer / polarizer / adhesive layer / transparent protective film / lambda / 4 phase difference liquid crystal layer; 8 is a λ / 4 retardation liquid crystal layer / transparent protective film / adhesive layer / polarizer / adhesive layer / transparent protective film / λ / 4 retardation liquid crystal layer; 9 is lambda / 4 phase difference liquid crystal layer / polarizer / adhesive layer / transparent protective film / alignment film / lambda / 4 phase difference liquid crystal layer; 10 is a λ / 4 retardation liquid crystal layer / alignment film / transparent protective film / adhesive layer / polarizer / adhesive layer / transparent protective film / alignment film / λ / 4 retardation liquid crystal layer; 11 is a lambda / 4 phase difference film layer / adhesive layer / polarizer / adhesive layer / lambda / 2 phase difference film layer / alignment film / lambda / 4 phase difference liquid crystal layer; 12 is a λ / 4 retardation film layer / adhesive layer / polarizer / adhesive layer / λ / 2 retardation film layer / adhesive layer / λ / 4 retardation film layer; 13 is a λ / 4 retardation film layer / adhesive layer / polarizer / alignment film / λ / 2 retardation liquid crystal layer / alignment film / λ / 4 retardation liquid crystal layer; Fig. 14 is composed of lambda / 4 phase difference film layer / adhesive layer / polarizer / adhesive layer / transparent protective film / alignment film / lambda / 2 phase difference liquid crystal layer / alignment film / lambda / 4 phase difference liquid crystal layer.

The polarizer of this invention uses the thing in which the dichroic dye was adsorption-oriented to the stretched polyvinyl alcohol-type film.

The polyvinyl alcohol-based resin constituting the polarizer can be produced by saponifying a polyvinyl acetate-based resin. As an example of polyvinyl acetate type resin, the copolymer etc. with vinyl acetate and the other monomer copolymerizable with this besides the polyvinyl acetate which is a homopolymer of vinyl acetate are mentioned. Specific examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, unsaturated sulfonic acids, olefins, vinyl ethers, acrylamides having an ammonium group, and the like. In addition, the polyvinyl alcohol-based resin may be modified, for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The degree of saponification of the polyvinyl alcohol-based resin may be 85 to 100 mol%, preferably 98 mol% or more. In addition, the degree of polymerization of the polyvinyl alcohol-based resin is usually 1,000 to 10,000, preferably 1,500 to 5,000.

As the lambda / 4 phase difference layer of the present invention, a lambda / 4 phase difference film layer or a lambda / 4 phase difference liquid crystal layer may be used. The slow axis of the λ / 4 retardation layer is arranged to form an angle of 45 ° with the transmission axis of the polarizer (left of FIG. 15).

The lambda / 4 phase difference film layer is emitted by delaying the phase by 1/4 with respect to the component oscillating the incident light (λ) in the slow axis direction. This delays the phase by 1/4 with respect to any reference wavelength of the incident light λ in the visible light region, and has a phase delay value of 110 to 170 nm based on the incident light having a reference wavelength of 589.3 nm.

The material of the [lambda] / 4 retardation film layer is not particularly limited, but specific intrinsic birefringence values can be produced using positive, negative or mixed materials thereof.

In the present invention, the "material having a positive birefringence value" refers to a material having optically positive uniaxial property when molecules are oriented with a uniaxial order. For example, when the positive material is a resin, when the light is incident on a layer in which molecules have a uniaxial orientation, the refractive index of the light in the alignment direction is greater than the refractive index of the light in the direction orthogonal to the alignment direction. Say.

In addition, in this invention, "a material whose negative birefringence value is negative" means the material which has the characteristic which shows negative uniaxial property optically when a molecule is oriented with uniaxial order. For example, when the negative material is a resin, when light is incident on a layer formed with molecules having a uniaxial orientation, the resin has a refractive index of light in the alignment direction smaller than that of light in a direction orthogonal to the alignment direction. Say.

The positive or negative material is preferably a resin.

As the positive resin, specifically, an olefin polymer (eg, polyethylene, polypropylene, norbornene polymer, cycloolefin polymer, etc.), a polyester polymer (eg, polyethylene terephthalate, polybutylene terephthalate, etc.), poly Arylene sulfide-based polymers (e.g., polyphenylene sulfide, etc.), polyvinyl alcohol-based polymers, polycarbonate-based polymers, polyallylate-based polymers, cellulose ester-based polymers (the intrinsic birefringence may be negative), polyether sulfone-based Polymers, polysulfone-based polymers, polyallyl sulfone-based polymers, polyvinyl chloride-based polymers, or poly-membered (binary, ternary, etc.) copolymers thereof. These can use together single 1 type or 2 types or more.

As the negative resin, specifically, polystyrene, polystyrene-based polymer (copolymer of styrene or styrene derivative and other monomer), polyacrylonitrile-based polymer, polymethyl methacrylate-based polymer, cellulose ester-based polymer (the intrinsic birefringence value is Amount), or a multi-membered (two-membered, ternary, etc.) copolymer polymer or the like. These may be used individually by 1 type, but may use 2 or more types together.

As the polystyrene polymer, a copolymer of styrene or a styrene derivative and at least one selected from acrylonitrile, maleic anhydride, methyl methacrylate and butadiene is preferable. In the present invention, at least one selected from polystyrene, polystyrene-based polymer, polyacrylonitrile-based polymer, and polymethyl methacrylate-based polymer is preferable, and among them, polystyrene and polystyrene-based polymer are more preferable in view of high birefringence expression. In view of high heat resistance, a copolymer of styrene and / or styrene derivative with maleic anhydride is particularly preferred.

The λ / 4 retardation film layer is, for example, produced a film by a solution film forming method or an extrusion molding method, it is diagonally stretched. Gradient stretching is a stretching method in which the direction of slow axis is formed diagonally instead of parallel or perpendicular to the direction of MD (Machine Direction) by varying the moving speed of both ends in the stretching process of the long film.

The lambda / 4 phase difference film layer of the present invention can be bonded to the polarizer surface or the protective film surface of the polarizer by roll to roll (roll to roll) has an advantage in improving productivity.

Moreover, this invention can use the (lambda) / 4 phase (s) difference liquid crystal layer which has the optical anisotropy and the liquid crystal compound which has crosslinking property by light or heat is contained. The liquid crystal compound may include, for example, a reactive liquid crystal compound (RM). Examples of the reactive liquid crystal compound (RM) include those described in Information Display 10, No. 1 (Recent Research Trends of Reactive Liquid Crystal Monomer (RM)).

The reactive liquid crystal compound refers to a monomer molecule having a liquid crystal phase including a mesogen capable of expressing liquid crystal and a terminal group capable of polymerization. By polymerizing the reactive liquid crystal compound, it is possible to obtain a crosslinked polymer network while maintaining the aligned phase of the liquid crystal. When the reactive liquid crystal compound molecules are cooled from the clearing point, a large area domain having a structure that is better aligned at a relatively low viscosity in the liquid crystal phase may be obtained than when the liquid crystal polymer having the same structure is used.

The lambda / 4 phase difference layer thus formed is mechanically and thermally stable because it has a solid thin film form while maintaining the properties such as optical anisotropy and dielectric constant of the liquid crystal.

The reactive liquid crystal compound (RM) may be used as a liquid crystal coating composition by diluting in a solvent in order to secure the efficiency of the coating process and the uniformity of the coating layer. Preferably, it is good to melt | dissolve in the solvent which can melt | dissolve a liquid crystal compound, and to have uniformity.

For example, the reactive liquid crystal compound may be a liquid crystal coating using a solvent capable of dissolving it, specifically one or two or more mixed solvents selected from propylene glycol monomethyl ether acetate (PGMEA), methyl ethyl ketone (MEK), xylene, and chloroform. The composition for preparation can be manufactured.

In addition, the reactive liquid crystal compound comprises an initiator for polymerizing and crosslinking it to prepare a coating layer forming composition. As the initiator, a known photopolymerization initiator or a thermal polymerization initiator may be used, and a photopolymerization initiator is preferable because of easy reaction time and control. The initiator is 10% by weight or less, preferably 0.1 to 5% by weight based on the total solids of the reactive liquid crystal compound.

The reactive liquid crystal compound further includes an additive to prepare a coating layer forming composition. Additives include, for example, dispersants, binders (eg, free radical polymerizable and cationic polymerizable binders), preservatives (eg, glutaraldehyde, tetramethylolacetyleneurea), silane coupling agents, leveling agents, crosslinking agents, antioxidants Degassers, defoamers, viscosity modifiers, flow improvers, sedimentation inhibitors, gloss improvers, lubricants, adhesion promoters, anti-skinning agents, metting agents, emulsifiers, stabilizers, hydrophobic agents, light stabilizer additives, treatment improvers and antistatic agents have.

The content of the reactive liquid crystal compound in the liquid crystal coating composition is to maintain 5 to 30% by weight. If the content is less than 5% by weight, it is impossible to implement retardation, and when the content exceeds 30% by weight, the reactive liquid crystal compound is precipitated, making it difficult to form a uniform liquid crystal coating layer.

The lambda / 4 phase difference liquid crystal layer of the present invention can be formed by coating a liquid crystal coating composition containing a reactive liquid crystal compound directly on the polarizer surface.

In addition, the λ / 4 retardation liquid crystal layer may be formed by bonding a transparent protective film to a polarizer with a known adhesive and coating a liquid crystal coating composition containing a reactive liquid crystal compound directly on the transparent protective film.

The coating method is not particularly limited, but specifically, pin coating, roll coating, dispensing coating, or gravure coating may be used. It is desirable to determine the type and amount of solvent depending on the coating method.

The coated lambda / 4 phase difference liquid crystal layer is applied so as to have a thickness of 0.01 to 10㎛ after drying. It is possible to easily form a λ / 4 retardation layer having a uniform optical characteristics in the thickness range. At this time, the solvent is evaporated through a known drying process.

In addition, the λ / 4 retardation liquid crystal layer may be formed by applying a composition for liquid crystal coating containing a reactive liquid crystal compound (RM) to a substrate, and then irradiating polarized ultraviolet rays, polarized electromagnetic waves, and the like to photocuring them. In this case, the light exiting the λ / 4 retardation layer may be circularly polarized or elliptically polarized light.

In addition, the lambda / 4 phase difference liquid crystal layer may be formed by forming an alignment film on the transparent protective film, by coating a liquid crystal coating composition containing a liquid crystal compound (RM) on the alignment film.

Specifically, the alignment film formed on the transparent protective film is rubbed with an exposure or rubbing roll with polarized light to impart orientation. After coating the liquid crystal coating composition containing the reactive liquid crystal compound (RM) on the alignment layer, and irradiated with electromagnetic waves such as ultraviolet rays to photocuring to form a lambda / 4 phase difference layer.

The alignment layer is generally used in the art and is not particularly limited, but an organic alignment layer is preferably used. More preferably, those described in International Patent No. 2005/096041, Japanese Patent Application Laid-open No. Hei 10-123461, and Japanese Patent Application Laid-open No. Hei 10-227998 may be used.

As the organic alignment film, a composition for forming an alignment film containing an acrylate type, a polyimide type, or a polyamic acid may be used. The polyamic acid is a polymer obtained by reacting diamine and dianhydride, and the polyimide is obtained by imidating the polyamic acid, and their structure is not particularly limited.

It is important to maintain a suitable viscosity of the composition for forming an alignment film. When the viscosity is too high, it is difficult to form an alignment film having a uniform thickness because it does not easily flow even when pressure is applied. When the viscosity is too low, the spreadability is good, but it is difficult to control the thickness of the alignment film. For example, it is preferable that they are 1cP thru | or 13cP at 25 degreeC.

In addition, it is preferable that the composition for forming the alignment layer considers the surface tension, the solid content, the volatility of the solvent, and the like. In particular, since the content of solid content affects the viscosity and surface tension, it is good to adjust the thickness and curing characteristics of the alignment film in consideration of the same. If the solid content is too high, the viscosity is high, the thickness of the alignment film is thick, if it is too low, there is a problem that a high proportion of the solvent causes a stain after drying the solution. For example, the content of the solid content is preferably 0.1 to 30% by weight.

It is preferable that the composition for oriented film formation is a solution form in which solid content, such as an acrylate type, a polyimide type, or a polyamic acid, melt | dissolved in the solvent. The solvent is not particularly limited as long as it can dissolve the solid content. Specifically, butyl cellosolve, gamma-butyrolactone, N-methyl-2-pyrrolidone and dipropylene glycol monomethyl ether may be used.

Such solvents are suitably mixed so as to form a uniform alignment film in consideration of solubility, viscosity, surface tension, and the like.

In addition to the alignment layer composition, a crosslinking agent and a coupling agent may be further mixed to form an effective alignment layer.

The alignment film is prepared by applying the composition for forming an alignment film on one side of the transparent protective film.

The application is not particularly limited as long as it is a method commonly used in the art. For example, application of the alignment layer composition may be carried out using a flow casting method and a method of applying an air knife, gravure, reverse roll, kiss roll, spray or blade. It can be formed by applying directly in a suitable development manner.

In order to improve the coating efficiency of the alignment film composition, a drying process may be further performed.

Drying is not particularly limited and can be generally carried out using a hot air dryer or a far infrared heater, the drying temperature is usually 30 to 100 ℃, preferably 50 to 80 ℃, drying time is usually 10 to 600 seconds, preferably 50 to 120 seconds is preferred.

In addition, the lambda / 2 phase difference layer of the present invention can be used for the lambda / 2 phase difference film layer or lambda / 2 phase difference liquid crystal layer. The λ / 2 retardation layer retards the phase by 1/2 with respect to any reference wavelength of the incident light λ in the visible light region. In addition, the manufacturing method, material, etc. of a layer are the same as that of the said (lambda) / 4 phase (s) difference layer.

At this time, the slow axis of the λ / 2 retardation layer is arranged to be essentially at an angle of 15 ° with respect to the transmission axis of the polarizer, and the slow axis of the λ / 4 retardation layer is essentially at an angle of 75 ° with respect to the transmission axis of the polarizer (Fig. 15 right). . Here, essentially 15 ° and essentially 75 ° means that the angle is allowed to about ± 5 ° around each angle, specifically, it can be in the range of 10 to 20 ° and 70 to 80 °.

Usually, a phase difference layer in which a lambda / 4 phase difference layer is formed on a lambda / 2 phase difference layer is called a broadband phase difference layer. The broadband retardation layer has a phase delay effect by 1/4 of the entire visible light region. In the image display apparatus to which the wideband phase difference layer is applied, the generation of light leakage and the like can be remarkably improved compared to the lambda / 4 phase difference layer, so that the image display can be clear.

In addition, the light passing through the broadband retardation layer and the polarizer exhibits elliptical polarization (including circular polarization).

In the broadband retardation layer of the present invention, the λ / 2 retardation layer and the λ / 4 retardation layer are respectively retardation film layers or retardation liquid crystal layers, or they may be mixed.

In the polarizing plate of the present invention, a λ / 2 retardation layer and a λ / 4 retardation layer may be respectively formed on the polarizer, or a broadband retardation layer (λ / 2 retardation layer + λ / 4 retardation layer) may be directly formed.

In addition, the polarizing plate of the present invention may be formed on either side of the polarizer, respectively, or a lambda / 4 phase difference layer (λ / 2 phase difference layer + lambda / 4 phase difference layer) or a mixture thereof.

The present invention may further comprise an anti-glare laminate to prevent surface protection and lubricating shapes on the lambda / 4 phase difference layer. In addition, a surface treatment layer such as a hard coating layer, an antireflection layer, an anti-stick layer, a diffusion barrier layer, and an anti-glare layer may be further stacked.

The transparent protective film may be used a film excellent in transparency, mechanical strength, thermal stability, moisture shielding, isotropy and the like. Specific examples include polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate and polybutylene terephthalate; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resin; Acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymers; Polyolefin-based resins such as polyethylene, polypropylene, cyclo-based or norbornene-structured polyolefins, ethylene-propylene copolymers; Vinyl chloride-based resins; Amide resins such as nylon and aromatic polyamides; Imide resin; Polyether sulfone resin; Sulfone resins; Polyether sulfone resin; Polyether ether ketone resins; Sulfided polyphenylene resins; Vinyl alcohol-based resins; Vinylidene chloride-based resins; Vinyl butyral resin; Allyl resins; Polyoxymethylene resin; And films composed of thermoplastic resins such as epoxy resins, and the like, and films composed of blends of the above thermoplastic resins may also be used. Moreover, the film of thermosetting resin or ultraviolet curable resin, such as (meth) acrylic-type, urethane type, acrylurethane type, epoxy type, and silicone type, can also be used.

Such a transparent protective film may be one containing an appropriate one or more additives. As an additive, a ultraviolet absorber, antioxidant, a lubricating agent, a plasticizer, a mold release agent, a coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a coloring agent, etc. are mentioned, for example.

In the present invention, a pressure-sensitive adhesive or an adhesive used for adhesion of the polarizer, the protective film, the retardation plate and the like can be applied to those known in the art.

The polarizing plate of the present invention can be manufactured by a continuous bonding process such as roll-to-roll, and it is easy to mass-produce and thin in high yield due to easy material loss and foreign matter management compared to the prior art.

Moreover, this invention can manufacture a roll-shaped polarizing plate. When the polarizing plate is applied to an image display device, since the sheet can be cut into pieces to fit the size of the image display device, there is an advantage of low material loss.

The polarizing plate of the present invention can be used for an organic light emitting display device, a plasma display, and the like, and is particularly useful when applied to a liquid crystal shutter glasses type stereoscopic image display device using an organic light emitting display device.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but the following examples are merely for exemplifying the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. It is natural that such variations and modifications fall within the scope of the appended claims.

Example 1

As shown in FIG. 2, a cycloolefin-based diagonally stretched λ / 4 retardation film layer was bonded to both surfaces of the PVA polarizer with a PVA (polyvinyl alcohol) adhesive to prepare a roll-shaped polarizing plate. At this time, the slow axis of the λ / 4 retardation layer was arranged to form an angle of 45 ° with respect to the transmission axis of the polarizer (left of FIG. 15).

Example 2

As shown in FIG. 3, one side of the PVA polarizer is bonded to a cycloolefin-based diagonally stretched λ / 4 retardation film layer with a PVA (polyvinyl alcohol) adhesive, and the other side includes a reactive liquid crystal compound (Merck, RMS03-013). After coating and drying the composition, a 1.5 μm liquid crystal coating layer was formed and photocured with ultraviolet light polarized for 500 seconds with a 14 mW exposure lamp to prepare a roll-shaped polarizing plate having a λ / 4 phase difference liquid crystal layer. At this time, the slow axis of the λ / 4 retardation layer was disposed to form an angle of 45 ° with respect to the transmission axis of the polarizer.

Example 3

As shown in Fig. 11, one side of the PVA polarizer is bonded to the cycloolefin-based gradient stretched λ / 4 retardation film layer with a PVA (polyvinyl alcohol) adhesive, and the other side is a cyclo bonded with a PVA (polyvinyl alcohol) adhesive. The roll-shaped polarizing plate in which the olefin type diagonal stretched (lambda) / 2 phase (s) difference film layer and (lambda) / 4 phase (s) difference liquid crystal layer was formed was produced. At this time, the slow axis of the λ / 4 retardation film layer is disposed to form an angle of 45 ° with respect to the transmission axis of the polarizer (left of FIG. 15), and the slow axis of the λ / 2 retardation film layer is 15 ° with respect to the transmission axis of the polarizer, The slow axis of the λ / 4 retardation liquid crystal layer was arranged to form an angle of 75 ° with respect to the transmission axis of the polarizer (right side in FIG. 15).

The λ / 4 retardation liquid crystal layer is coated with an alignment film on the λ / 2 retardation film layer and dried, and then irradiated with ultraviolet light polarized with a 14 mW exposure lamp for 75 seconds to form an alignment film having a thickness of 1.5 nm after drying. After coating and drying a composition containing a reactive liquid crystal compound (Merck, RMS03-013), a liquid crystal coating layer having a thickness of 1.5 µm was formed and photocured with ultraviolet light for 500 seconds with a 14mW exposure lamp.

Experimental Example

As shown in Figs. 16 and 17, a 42 ”image display device (organic light emitting device) screen on which a stereoscopic image is displayed is prepared. Each polarizing plate manufactured in Example 1 and Example 3 was arrange | positioned on the front surface of a 42 "image display apparatus.

When using the polarizing plate of Example 1, it arrange | positioned as FIG. 16, and arrange | positioned the polarizing plate 20 containing the (lambda) / 4 phase (s) difference layer 23 for converting the light which passed the polarizer 21 to circularly polarized light. . And a λ / 4 retardation layer 33 for converting the circularly polarized light into linearly polarized light, a liquid crystal panel 31 synchronized to a time-divided display surface period, and a polarizer 35 for passing the light emitted from the liquid crystal panel. The liquid crystal shutter glasses 30 were disposed. At this time, the liquid crystal panel 31 uses STN mode, and the left and right sides of the liquid crystal shutter glasses 30 are arranged in the same manner. The slow axis of each of the lambda / 4 phase difference layer 23 of the polarizing plate 20 and the lambda / 4 phase difference layer 33 of the liquid crystal shutter glasses 30 were perpendicular to each other. In addition, the transmission axes of the polarizer 21 of the polarizing plate 20 and the polarizer 35 of the liquid crystal shutter glasses 30 were perpendicular to each other.

When using the polarizing plate of Example 3, it arrange | positions as FIG. 17, and (lambda) / 2 phase difference layer 41 and (lambda) / 4 phase difference layer 23 for converting the light which passed the polarizer 21 to circularly polarized light are used. The containing polarizing plate 20 was arrange | positioned. In addition, the λ / 4 phase difference layer 33, the λ / 2 phase difference layer 37 for converting the circularly polarized light into linearly polarized light, the liquid crystal panel 31 synchronized to the time-divided display surface period, and the light emitted from the liquid crystal panel The liquid crystal shutter glasses 30 including the polarizer 35 to pass through were placed. At this time, the liquid crystal panel 31 uses STN mode, and the left and right sides of the liquid crystal shutter glasses 30 are arranged in the same manner.

The λ / 4 phase difference layer 25 of the polarizing plate 20 forms an angle of 45 ° with respect to the transmission axis 22 of the polarizer 21, and the slow axis 42 of the λ / 2 phase difference layer 41 has the polarizer 21. 15 degrees with respect to the transmission axis 22 of (), the slow axis 24 of the (lambda) / 4 phase difference layer 23 forms an angle of 75 degrees with respect to the transmission axis 22 of the polarizer 21, and the liquid crystal shutter The slow axis 34 of the λ / 4 retardation layer 33 of the glasses 30 forms an angle of 165 ° with respect to the transmission axis 22 of the polarizer 21, and the slow axis of the λ / 2 retardation layer 37 38) made an angle of 105 ° with respect to the transmission axis 22 of the polarizer 21. In addition, the transmission axes of the polarizer 21 of the polarizing plate and the polarizer 35 of the liquid crystal shutter glasses 30 were perpendicular to each other.

18 shows the principle of confirming the stereoscopic image of the image display apparatus using the first embodiment.

As shown in Fig. 18, the light (natural light) emitted from the image display device (organic electroluminescent element) passes through the λ / 4 retardation layer 25 (natural light), and is transmitted by linear polarized light of the horizontal component in the polarizer 21, The light is converted into circularly polarized light while passing through the λ / 4 retardation layer 23. The circularly polarized light passes through the λ / 4 retardation layer 33 of the liquid crystal shutter glasses 30 and is converted into linearly polarized light of a horizontal component.

When the voltage is not applied to the liquid crystal panel 31, the linearly polarized light in the horizontal direction component passes through the linearly polarized light in the vertical direction component, and since the linearly polarized light in the vertical direction is the same as the transmission axis of the polarizer 35, the image can be viewed. On the other hand, when voltage is applied, linearly polarized light of the horizontal component passes through the horizontal component perpendicular to the transmission axis of the polarizer in the liquid crystal panel, thereby preventing the image from being seen.

19 shows the anti-reflection principle of the image display apparatus using the first embodiment.

As shown in FIG. 19, light incident from the outside (natural light) passes through the λ / 4 retardation layer 23 (natural light), passes through the polarizer 21, and becomes linearly polarized light in a horizontal component. The linearly polarized light passing through the polarizer passes through the λ / 4 retardation layer 25 and is converted into left circularly polarized light.

The left circularly polarized light is reflected by an image display device (organic electroluminescent element) to become right circularly polarized light in which the polarization directions are opposite. The right circularly polarized light passes through the λ / 4 retardation layer 25 and is converted into linearly polarized light of a vertical component, thereby preventing the polarizer 21 from passing through.

20 shows the principle of confirming the stereoscopic image of the image display apparatus using the third embodiment.

As shown in FIG. 20, light (natural light) emitted from an image display device (organic EL device) passes through the λ / 4 retardation layer 25 (natural light), and is transmitted by linear polarized light of a horizontal component in the polarizer 21, It passes through the [lambda] / 2 phase difference layer 41 and becomes linearly polarized light at an angle of 30 degrees with respect to the transmission axis 22 of the polarizer 21, and passes through the [lambda] / 4 phase difference layer 23 to be converted into left circularly polarized light. The circularly polarized light passes through the λ / 4 retardation layer 33 of the liquid crystal shutter glasses 30 and becomes linearly polarized light at an angle of 30 ° with respect to the transmission axis 22 of the polarizer 21, and the λ / 2 retardation layer. Passed by (37) is converted into linearly polarized light of the horizontal component.

When the voltage is not applied to the liquid crystal panel 31, the linearly polarized light in the horizontal direction component passes through the linearly polarized light in the vertical direction component, and since the linearly polarized light in the vertical direction is the same as the transmission axis of the polarizer 35, the image can be viewed. On the other hand, when voltage is applied, linearly polarized light of the horizontal component passes through the horizontal component perpendicular to the transmission axis of the polarizer in the liquid crystal panel, thereby preventing the image from being seen.

10: image display device (organic EL device)
1: electrode 2: electron transport layer
3: light emitting layer 4: hole transport layer
5: ITO layer 6: substrate
20: polarizer 21: polarizer
22: transmission axis of polarizer 23, 25, 33: lambda / 4 phase difference layer
24, 26, 34: slow axis of lambda / 4 phase difference layer 28: junction of lambda / 4 phase difference layer
37 and 41: lambda / 2 retardation layers 38 and 42: slow axis of lambda / 2 retardation layers
30 liquid crystal shutter glasses 31 liquid crystal panel
35: polarizer 36: transmission axis of polarizer

Claims (12)

A λ / 4 retardation layer is formed on both sides of the polarizer, and these two retardation layers are layers or gradient stretched films containing a reactive liquid crystal compound independently of each other.
The polarizing plate of claim 1, wherein one of the two λ / 4 retardation layers is a layer containing a reactive liquid crystal compound, and the other is a gradient stretched film.
The polarizing plate of claim 1, wherein a transparent protective film is bonded between the polarizer and at least one of the λ / 4 retardation layers.
The polarizing plate of claim 3, wherein an alignment layer is formed between at least one of the transparent protective film and the λ / 4 retardation layer.
The polarizing plate according to claim 1, wherein the transmission axis of the polarizer forms an angle of 45 ° with a slow axis of the λ / 4 retardation layer.
The polarizing plate according to claim 1, wherein a λ / 2 retardation layer is formed between the polarizer and at least one of the λ / 4 retardation layers.
The polarizing plate of claim 6, wherein the slow axis of the λ / 2 retardation layer is essentially 15 ° with respect to the transmission axis of the polarizer, and the slow axis of the λ / 4 retardation layer is essentially 75 ° with respect to the transmission axis of the polarizer.
The polarizing plate of any one of Claims 1-7 in which the said polarizing plate is roll shape.
An organic light emitting device comprising the polarizing plate of claim 8.
A method of manufacturing a polarizing plate, comprising the steps of: forming a lambda / 4 phase difference layer by bonding a composition containing a reactive liquid crystal compound after bonding an inclined stretched film or forming an alignment layer on the polarizer independently on both sides of the polarizer.
The method of claim 10, further comprising bonding a transparent protective film to at least one surface of the polarizer before forming the λ / 4 retardation layer.
The method of claim 10, further comprising forming a λ / 2 retardation layer by bonding a film to at least one surface of the polarizer or applying a composition containing a reactive liquid crystal compound before forming the λ / 4 retardation layer. .

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